Just saw it in Cydia, the name is AdBlocker. Price is $1.99 by the same guy who makes FullScreen for Safari. I have FullScreen for Safari and its great now after the updates by the developer. Months ago I had tried another adblocker (link) it blocked some ads but it actually slowed the loading times in Safari. If this app can actually speed up Safari load times then it will definitely be worth it. For those that have tried it please post your opinions.